RawScript
frontend::CompileScript(JSContext *cx, HandleObject scopeChain,
HandleScript evalCaller,
const CompileOptions &options,
const jschar *chars, size_t length,
JSString *source_ /* = NULL */,
unsigned staticLevel /* = 0 */,
SourceCompressionToken *extraSct /* = NULL */)
{
RootedString source(cx, source_);
/*
* The scripted callerFrame can only be given for compile-and-go scripts
* and non-zero static level requires callerFrame.
*/
JS_ASSERT_IF(evalCaller, options.compileAndGo);
JS_ASSERT_IF(staticLevel != 0, evalCaller);
if (!CheckLength(cx, length))
return NULL;
JS_ASSERT_IF(staticLevel != 0, options.sourcePolicy != CompileOptions::LAZY_SOURCE);
ScriptSource *ss = cx->new_<ScriptSource>();
if (!ss)
return NULL;
if (options.filename && !ss->setFilename(cx, options.filename))
return NULL;
ScriptSourceHolder ssh(ss);
SourceCompressionToken mysct(cx);
SourceCompressionToken *sct = (extraSct) ? extraSct : &mysct;
switch (options.sourcePolicy) {
case CompileOptions::SAVE_SOURCE:
if (!ss->setSourceCopy(cx, chars, length, false, sct))
return NULL;
break;
case CompileOptions::LAZY_SOURCE:
ss->setSourceRetrievable();
break;
case CompileOptions::NO_SOURCE:
break;
}
Parser<FullParseHandler> parser(cx, options, chars, length, /* foldConstants = */ true);
if (!parser.init())
return NULL;
parser.sct = sct;
GlobalSharedContext globalsc(cx, scopeChain, StrictModeFromContext(cx));
ParseContext<FullParseHandler> pc(&parser, NULL, &globalsc, staticLevel, /* bodyid = */ 0);
if (!pc.init())
return NULL;
bool savedCallerFun =
options.compileAndGo &&
evalCaller &&
(evalCaller->function() || evalCaller->savedCallerFun);
Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), savedCallerFun,
options, staticLevel, ss, 0, length));
if (!script)
return NULL;
// Global/eval script bindings are always empty (all names are added to the
// scope dynamically via JSOP_DEFFUN/VAR).
InternalHandle<Bindings*> bindings(script, &script->bindings);
if (!Bindings::initWithTemporaryStorage(cx, bindings, 0, 0, NULL))
return NULL;
// We can specialize a bit for the given scope chain if that scope chain is the global object.
JSObject *globalScope = scopeChain && scopeChain == &scopeChain->global() ? (JSObject*) scopeChain : NULL;
JS_ASSERT_IF(globalScope, globalScope->isNative());
JS_ASSERT_IF(globalScope, JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(globalScope->getClass()));
BytecodeEmitter bce(/* parent = */ NULL, &parser, &globalsc, script, evalCaller, !!globalScope,
options.lineno, options.selfHostingMode);
if (!bce.init())
return NULL;
/* If this is a direct call to eval, inherit the caller's strictness. */
if (evalCaller && evalCaller->strict)
globalsc.strict = true;
if (options.compileAndGo) {
if (source) {
/*
* Save eval program source in script->atoms[0] for the
* eval cache (see EvalCacheLookup in jsobj.cpp).
*/
JSAtom *atom = AtomizeString<CanGC>(cx, source);
jsatomid _;
if (!atom || !bce.makeAtomIndex(atom, &_))
return NULL;
}
if (evalCaller && evalCaller->functionOrCallerFunction()) {
/*
* An eval script in a caller frame needs to have its enclosing
* function captured in case it refers to an upvar, and someone
* wishes to decompile it while it's running.
*/
JSFunction *fun = evalCaller->functionOrCallerFunction();
ObjectBox *funbox = parser.newFunctionBox(fun, &pc, fun->strict());
if (!funbox)
return NULL;
bce.objectList.add(funbox);
}
}
bool canHaveDirectives = true;
for (;;) {
TokenKind tt = parser.tokenStream.peekToken(TSF_OPERAND);
if (tt <= TOK_EOF) {
if (tt == TOK_EOF)
break;
JS_ASSERT(tt == TOK_ERROR);
return NULL;
}
ParseNode *pn = parser.statement();
if (!pn)
return NULL;
if (canHaveDirectives) {
if (!parser.maybeParseDirective(pn, &canHaveDirectives))
return NULL;
}
if (!FoldConstants(cx, &pn, &parser))
return NULL;
if (!NameFunctions(cx, pn))
return NULL;
if (!EmitTree(cx, &bce, pn))
return NULL;
parser.handler.freeTree(pn);
}
if (!SetSourceMap(cx, parser.tokenStream, ss, script))
return NULL;
if (evalCaller && evalCaller->functionOrCallerFunction()) {
// Watch for uses of 'arguments' within the evaluated script, both as
// free variables and as variables redeclared with 'var'.
RootedFunction fun(cx, evalCaller->functionOrCallerFunction());
HandlePropertyName arguments = cx->names().arguments;
for (AtomDefnRange r = pc.lexdeps->all(); !r.empty(); r.popFront()) {
if (r.front().key() == arguments) {
if (!CheckArgumentsWithinEval(cx, parser, fun))
return NULL;
}
}
for (AtomDefnListMap::Range r = pc.decls().all(); !r.empty(); r.popFront()) {
if (r.front().key() == arguments) {
if (!CheckArgumentsWithinEval(cx, parser, fun))
return NULL;
}
}
// If the eval'ed script contains any debugger statement, force construction
// of arguments objects for the caller script and any other scripts it is
// transitively nested inside.
if (pc.sc->hasDebuggerStatement()) {
RootedObject scope(cx, scopeChain);
while (scope->isScope() || scope->isDebugScope()) {
if (scope->isCall() && !scope->asCall().isForEval()) {
RootedScript script(cx, scope->asCall().callee().nonLazyScript());
if (script->argumentsHasVarBinding()) {
if (!JSScript::argumentsOptimizationFailed(cx, script))
return NULL;
}
}
scope = scope->enclosingScope();
}
}
}
/*
* Nowadays the threaded interpreter needs a stop instruction, so we
* do have to emit that here.
*/
if (Emit1(cx, &bce, JSOP_STOP) < 0)
return NULL;
if (!JSScript::fullyInitFromEmitter(cx, script, &bce))
return NULL;
bce.tellDebuggerAboutCompiledScript(cx);
if (sct == &mysct && !sct->complete())
return NULL;
return script;
}
JSScript *
frontend::CompileScript(ExclusiveContext *cx, LifoAlloc *alloc, HandleObject scopeChain,
HandleScript evalCaller,
const CompileOptions &options,
const jschar *chars, size_t length,
JSString *source_ /* = NULL */,
unsigned staticLevel /* = 0 */,
SourceCompressionToken *extraSct /* = NULL */)
{
RootedString source(cx, source_);
SkipRoot skip(cx, &chars);
if (cx->isJSContext())
MaybeCallSourceHandler(cx->asJSContext(), options, chars, length);
/*
* The scripted callerFrame can only be given for compile-and-go scripts
* and non-zero static level requires callerFrame.
*/
JS_ASSERT_IF(evalCaller, options.compileAndGo);
JS_ASSERT_IF(evalCaller, options.forEval);
JS_ASSERT_IF(staticLevel != 0, evalCaller);
if (!CheckLength(cx, length))
return NULL;
JS_ASSERT_IF(staticLevel != 0, options.sourcePolicy != CompileOptions::LAZY_SOURCE);
ScriptSource *ss = cx->new_<ScriptSource>(options.originPrincipals());
if (!ss)
return NULL;
if (options.filename && !ss->setFilename(cx, options.filename))
return NULL;
JS::RootedScriptSource sourceObject(cx, ScriptSourceObject::create(cx, ss));
if (!sourceObject)
return NULL;
// Saving source is not yet supported when parsing off thread.
JS_ASSERT_IF(!cx->isJSContext(), !extraSct && options.sourcePolicy == CompileOptions::NO_SOURCE);
SourceCompressionToken *sct = extraSct;
Maybe<SourceCompressionToken> mysct;
if (cx->isJSContext() && !sct) {
mysct.construct(cx->asJSContext());
sct = mysct.addr();
}
switch (options.sourcePolicy) {
case CompileOptions::SAVE_SOURCE:
if (!ss->setSourceCopy(cx->asJSContext(), chars, length, false, sct))
return NULL;
break;
case CompileOptions::LAZY_SOURCE:
ss->setSourceRetrievable();
break;
case CompileOptions::NO_SOURCE:
break;
}
bool canLazilyParse = CanLazilyParse(cx, options);
Maybe<Parser<SyntaxParseHandler> > syntaxParser;
if (canLazilyParse) {
syntaxParser.construct(cx, alloc, options, chars, length, /* foldConstants = */ false,
(Parser<SyntaxParseHandler> *) NULL,
(LazyScript *) NULL);
}
Parser<FullParseHandler> parser(cx, alloc, options, chars, length, /* foldConstants = */ true,
canLazilyParse ? &syntaxParser.ref() : NULL, NULL);
parser.sct = sct;
parser.ss = ss;
Directives directives(options.strictOption);
GlobalSharedContext globalsc(cx, scopeChain, directives, options.extraWarningsOption);
bool savedCallerFun =
options.compileAndGo &&
evalCaller &&
(evalCaller->function() || evalCaller->savedCallerFun);
Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), savedCallerFun,
options, staticLevel, sourceObject, 0, length));
if (!script)
return NULL;
// Global/eval script bindings are always empty (all names are added to the
// scope dynamically via JSOP_DEFFUN/VAR).
InternalHandle<Bindings*> bindings(script, &script->bindings);
if (!Bindings::initWithTemporaryStorage(cx, bindings, 0, 0, NULL))
return NULL;
// We can specialize a bit for the given scope chain if that scope chain is the global object.
JSObject *globalScope = scopeChain && scopeChain == &scopeChain->global() ? (JSObject*) scopeChain : NULL;
JS_ASSERT_IF(globalScope, globalScope->isNative());
JS_ASSERT_IF(globalScope, JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(globalScope->getClass()));
BytecodeEmitter::EmitterMode emitterMode =
options.selfHostingMode ? BytecodeEmitter::SelfHosting : BytecodeEmitter::Normal;
BytecodeEmitter bce(/* parent = */ NULL, &parser, &globalsc, script, options.forEval, evalCaller,
!!globalScope, options.lineno, emitterMode);
if (!bce.init())
return NULL;
// Syntax parsing may cause us to restart processing of top level
// statements in the script. Use Maybe<> so that the parse context can be
// reset when this occurs.
Maybe<ParseContext<FullParseHandler> > pc;
pc.construct(&parser, (GenericParseContext *) NULL, (ParseNode *) NULL, &globalsc,
(Directives *) NULL, staticLevel, /* bodyid = */ 0);
if (!pc.ref().init())
return NULL;
/* If this is a direct call to eval, inherit the caller's strictness. */
if (evalCaller && evalCaller->strict)
globalsc.strict = true;
if (options.compileAndGo) {
if (source) {
/*
* Save eval program source in script->atoms[0] for the
* eval cache (see EvalCacheLookup in jsobj.cpp).
*/
JSAtom *atom = AtomizeString<CanGC>(cx, source);
jsatomid _;
if (!atom || !bce.makeAtomIndex(atom, &_))
return NULL;
}
if (evalCaller && evalCaller->functionOrCallerFunction()) {
/*
* An eval script in a caller frame needs to have its enclosing
* function captured in case it refers to an upvar, and someone
* wishes to decompile it while it's running.
*/
JSFunction *fun = evalCaller->functionOrCallerFunction();
Directives directives(/* strict = */ fun->strict());
ObjectBox *funbox = parser.newFunctionBox(/* fn = */ NULL, fun, pc.addr(), directives);
if (!funbox)
return NULL;
bce.objectList.add(funbox);
}
}
bool canHaveDirectives = true;
for (;;) {
TokenKind tt = parser.tokenStream.peekToken(TokenStream::Operand);
if (tt <= TOK_EOF) {
if (tt == TOK_EOF)
break;
JS_ASSERT(tt == TOK_ERROR);
return NULL;
}
TokenStream::Position pos(parser.keepAtoms);
parser.tokenStream.tell(&pos);
ParseNode *pn = parser.statement(canHaveDirectives);
if (!pn) {
if (parser.hadAbortedSyntaxParse()) {
// Parsing inner functions lazily may lead the parser into an
// unrecoverable state and may require starting over on the top
// level statement. Restart the parse; syntax parsing has
// already been disabled for the parser and the result will not
// be ambiguous.
parser.clearAbortedSyntaxParse();
parser.tokenStream.seek(pos);
// Destroying the parse context will destroy its free
// variables, so check if any deoptimization is needed.
if (!MaybeCheckEvalFreeVariables(cx, evalCaller, scopeChain, parser, pc.ref()))
return NULL;
pc.destroy();
pc.construct(&parser, (GenericParseContext *) NULL, (ParseNode *) NULL,
&globalsc, (Directives *) NULL, staticLevel, /* bodyid = */ 0);
if (!pc.ref().init())
return NULL;
JS_ASSERT(parser.pc == pc.addr());
pn = parser.statement();
}
if (!pn) {
JS_ASSERT(!parser.hadAbortedSyntaxParse());
return NULL;
}
}
if (canHaveDirectives) {
if (!parser.maybeParseDirective(/* stmtList = */ NULL, pn, &canHaveDirectives))
return NULL;
}
if (!FoldConstants(cx, &pn, &parser))
return NULL;
// Inferring names for functions in compiled scripts is currently only
// supported while on the main thread. See bug 895395.
if (cx->isJSContext() && !NameFunctions(cx->asJSContext(), pn))
return NULL;
if (!EmitTree(cx, &bce, pn))
return NULL;
parser.handler.freeTree(pn);
}
if (!MaybeCheckEvalFreeVariables(cx, evalCaller, scopeChain, parser, pc.ref()))
return NULL;
if (!SetSourceMap(cx, parser.tokenStream, ss))
return NULL;
/*
* Nowadays the threaded interpreter needs a stop instruction, so we
* do have to emit that here.
*/
if (Emit1(cx, &bce, JSOP_STOP) < 0)
return NULL;
if (!JSScript::fullyInitFromEmitter(cx, script, &bce))
return NULL;
bce.tellDebuggerAboutCompiledScript(cx);
if (sct && !extraSct && !sct->complete())
return NULL;
return script;
}
// Compile a JS function body, which might appear as the value of an event
// handler attribute in an HTML <INPUT> tag, or in a Function() constructor.
bool
frontend::CompileFunctionBody(JSContext *cx, HandleFunction fun, CompileOptions options,
const AutoNameVector &formals, const jschar *chars, size_t length)
{
if (!CheckLength(cx, length))
return false;
ScriptSource *ss = cx->new_<ScriptSource>();
if (!ss)
return false;
ScriptSourceHolder ssh(ss);
SourceCompressionToken sct(cx);
JS_ASSERT(options.sourcePolicy != CompileOptions::LAZY_SOURCE);
if (options.sourcePolicy == CompileOptions::SAVE_SOURCE) {
if (!ss->setSourceCopy(cx, chars, length, true, &sct))
return false;
}
options.setCompileAndGo(false);
Parser<FullParseHandler> parser(cx, options, chars, length, /* foldConstants = */ true);
if (!parser.init())
return false;
parser.sct = &sct;
JS_ASSERT(fun);
fun->setArgCount(formals.length());
/* FIXME: make Function format the source for a function definition. */
ParseNode *fn = CodeNode::create(PNK_FUNCTION, &parser.handler);
if (!fn)
return false;
fn->pn_body = NULL;
fn->pn_funbox = NULL;
fn->pn_cookie.makeFree();
ParseNode *argsbody = ListNode::create(PNK_ARGSBODY, &parser.handler);
if (!argsbody)
return false;
argsbody->setOp(JSOP_NOP);
argsbody->makeEmpty();
fn->pn_body = argsbody;
Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), false, options,
/* staticLevel = */ 0, ss,
/* sourceStart = */ 0, length));
if (!script)
return false;
// If the context is strict, immediately parse the body in strict
// mode. Otherwise, we parse it normally. If we see a "use strict"
// directive, we backup and reparse it as strict.
TokenStream::Position start;
parser.tokenStream.tell(&start);
bool initiallyStrict = StrictModeFromContext(cx);
bool becameStrict;
FunctionBox *funbox;
ParseNode *pn = parser.standaloneFunctionBody(fun, formals, script, fn, &funbox,
initiallyStrict, &becameStrict);
if (!pn) {
if (initiallyStrict || !becameStrict || parser.tokenStream.hadError())
return false;
// Reparse in strict mode.
parser.tokenStream.seek(start);
pn = parser.standaloneFunctionBody(fun, formals, script, fn, &funbox,
/* strict = */ true);
if (!pn)
return false;
}
BytecodeEmitter funbce(/* parent = */ NULL, &parser, funbox, script,
/* evalCaller = */ NullPtr(),
/* hasGlobalScope = */ false, options.lineno);
if (!funbce.init())
return false;
if (!NameFunctions(cx, pn))
return false;
if (fn->pn_body) {
JS_ASSERT(fn->pn_body->isKind(PNK_ARGSBODY));
fn->pn_body->append(pn);
fn->pn_body->pn_pos = pn->pn_pos;
pn = fn->pn_body;
}
if (!SetSourceMap(cx, parser.tokenStream, ss, script))
return false;
if (!EmitFunctionScript(cx, &funbce, pn))
return false;
if (!sct.complete())
return false;
return true;
}
